US4828925A - Magnetic disc - Google Patents

Magnetic disc Download PDF

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Publication number
US4828925A
US4828925A US06/875,581 US87558186A US4828925A US 4828925 A US4828925 A US 4828925A US 87558186 A US87558186 A US 87558186A US 4828925 A US4828925 A US 4828925A
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US
United States
Prior art keywords
magnetic
melting point
acid ester
aliphatic acid
oleate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/875,581
Other languages
English (en)
Inventor
Akira Miyake
Hitoshi Nagatani
Tsugihiro Doi
Kunio Mizushima
Akito Sakemoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Assigned to HITACHI MAXELL, LTD. reassignment HITACHI MAXELL, LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DOI, TSUGIHIRO, MIYAKE, AKIRA, MIZUSHIMA, KUNIO, NAGATANI, HITOSHI, SAKEMOTO, AKITO
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/71—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the lubricant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature

Definitions

  • the present invention relates to a magnetic disc, and more particularly, it relates to a magnetic disc with improved lubricity comprising a non-magnetic support substrate and a magnetic layer consisting of a magnetic coating which is formed on at least one surface, preferably on both surfaces of the substrate and comprises ferromagnetic powder and a binder.
  • the addition of the aliphatic acid ester to the magnetic coating satisfactorily increases lubricity, strength and durability of the magnetic coating of the video tape and the like.
  • a floppy disc is increasingly required to have better lubricity of the magnetic coating and durability and strength of the magnetic layer.
  • the floppy disc is slidingly forced against both its surfaces in such a state that it is held between a pair of the magnetic heads or between a magnetic head and a support member;
  • the thickness of the ferromagnetic coating layer should be decreased;
  • a so-called metal floppy disc which contains, for example, metal iron powder as the ferromagnetic powder has a softer coating than a floppy disc which contains a metal oxide as the ferromagnetic powder so that it has a larger coefficient of friction when slidingly contacted with the magnetic head.
  • liquid lubricant In order to improve the lubricity of the magnetic coating, use of a large amount of a liquid lubricant is particularly effective, since the liquid lubricant has good compatibility with the binder resin contained in the magnetic coating so that it can be contained in the magnetic layer in a larger amount. However, since the binder resin attracts a large number of the lubricant molecules, it swells so that its inherent binding force for the magnetic powder is decreased, which results in deterioration of the magnetic layer.
  • the lubricant Since the durability of the magnetic layer is deteriorated, if the amount of the lubricant is greatly increased it is desirable for the lubricant to be locally contained near the surface layer of the magnetic coating which is in sliding contact with the magnetic head and not homogeneously throughout the magnetic coating.
  • one object of the present invention is to provide a magnetic disc comprising a magnetic coating with prolonged lubricity and durability but no substantial decrease of strength.
  • Another object of the present invention is to provide a magnetic disc comprising a magnetic coating containing a solid aliphatic acid ester as a lubricant and having improved lubricity and durability.
  • a magnetic disc which comprises a non-magnetic support substrate and a magnetic layer consisting of a magnetic coating which is formed on at least one surface of the substrate and comprises ferromagnetic powder, a binder, an aliphatic acid ester having a melting point not higher than 10° C. (hereinafter referred to as “low melting point aliphatic acid ester”) and an aliphatic acid ester having a melting point of 15° to 60° C. (hereinafter referred to as "high melting point aliphatic acid ester).
  • the present invention has been completed based on the finding that when a liquid aliphatic acid ester, namely an ester having a melting point not higher than 10° C. is contained in the magnetic coating in addition to the solid aliphatic acid ester, the liquid ester is stably compatible with the binder resin and has good chemical affinity with the solid ester so that lubricity and durability of the magnetic coating are improved.
  • the low melting point aliphatic acid ester acts as a stabilizer for the high melting point aliphatic acid ester in the magnetic coating.
  • Specific examples of such an ester are n-butyl oleate, hexyl oleate, n-octyl oleate, 2-ethylhexyl oleate, oleyl oleate, n-butyl laurate, heptyl laurate, n-butyl myristate, n-butoxyethyl oleate, trimethylolpropane trioleate, and the like.
  • These esters may be used alone or as a mixture. Among them, 2-ethylhexyl oleate is preferred.
  • the high melting point aliphatic acid ester imparts lubricity to the magnetic coating without deteriorating the strength of the coating layer.
  • Specific examples of such an ester are stearyl laurate, cetyl laurate, myristyl laurate, stearyl myristate, cetyl myristate, myristyl myristate, stearyl palmitate, cetyl palmitate, myristyl palmitate, lauryl palmitate, cetyl stearate, myristyl stearate, lauryl stearate, n-butyl stearate, lauryl myristate, lauryl laurate, n-butoxyethyl stearate, n-butoxypropyl stearate, n-pentaoxyethyl stearate, and the like.
  • These esters may be used alone or as a mixture. Among them, n-butoxyethyl stearate is preferred.
  • the low melting point ester links the binder resin with the high melting point ester localized near the surface of the coating.
  • the binder resin used may be any one of conventionally used binder resins and includes copolymers of vinyl chloride, cellulose resins, polyurethane resins, polyacetal resins, polyester resins, isocyanate compounds and the like.
  • a molecular weight of the binder resin is preferably from 5,000 to 50,000, more preferably 10,000 to 40,000.
  • the isocyanate compound may have a molecular weight lower than this range.
  • preferred are the polyurethane resins, particularly branched polyurethane resin having primary hydroxyl groups attached to its backbone chain ends and the branched chain ends.
  • a total amount of the low molecular weight aliphatic acid ester and the high molecular weight aliphatic acid ester may be 10 to 100% by weight, more preferably 15 to 70% by weight per weight of the binder resin.
  • the total amount is less than the above lower limit, the desired effects are not exerted.
  • it is larger than the above upper limit white powder is formed on the magnetic coating surface so that the lubricating effect is decreased, the magnetic head is contaminated and the magnetic coating is deteriorated, which causes flaws of the magnetic layer.
  • a weight ratio of the low melting point ester and the high melting point ester is 10:1 to 1:10, preferably 10:1 to 1:1, more preferably 10:1 to 3:1.
  • the magnetic coating tends to be easily deteriorated.
  • the white powder tends to be formed on the coating surface.
  • the ferromagnetic powder to be contained in the magnetic coating is preferably of an acicular form with a particle size of 0.2 to 0.5 ⁇ m and an axis ratio of 6 to 10.
  • ferromagnetic powder having a specific surface area of 15 to 60 m 2 /g measured by the BET method is preferred.
  • ferromagnetic powder comprising the plate form or hexagonal system particles can be used.
  • the ferromagnetic powder are metal oxides (e.g. ⁇ -Fe 2 O 3 , Fe 3 O 4 , an intermediate oxide of ⁇ -Fe 2 O 3 and Fe 3 O 4 , cobalt-containing ⁇ -Fe 2 O 3 , cobalt-containing Fe 3 O 4 , a cobalt-containing intermediate oxide of ⁇ -Fe 2 O 3 and Fe 3 O 4 , CrO 2 , etc.), magnetic metals (e.g. iron, nickel, cobalt, etc.), alloys of the magnetic metal and other metal, nitrides of the formula: Fe x N, and the like.
  • the plate form or hexagonal system magnetic powder includes barium ferrite, strontium ferrite, and the like.
  • the amount of the ferromagnetic powder may be 10 to 1,000% by weight, more preferably 100 to 500% by weight based on the total weight on the low melting point ester, the high melting point ester and the binder resin. When it is too small, output of the recorded signal is lowered. When it is too large, the powder falls off.
  • the magnetic coating may contain conventional additives such as an abrasive, a surfactant, an antistatic agent and so on.
  • abrasive particularly preferred is alumina powder with a particle size of 0.2 to 1 ⁇ m and a BET specific surface area not larger than 10 m 2 /g.
  • surfactant any of the conventional ones such as aliphatic acids may be used.
  • the surfactant may be coated on or compounded in the magnetic coating.
  • antistatic agent any of the liquid or solid ones may be used. Carbon black is a preferred antistatic agent.
  • the amounts of these additives may be the same as contained in a conventional magnetic coating.
  • the magnetic coating may be prepared by a per se conventional method. For example, all or some of the components are charged in a suitable mixing equipment such as a kneader, a ball mill, a sand mill or a pebble mill and compounded. During compounding, a suitable solvent such as toluene, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone may be used.
  • a suitable mixing equipment such as a kneader, a ball mill, a sand mill or a pebble mill and compounded.
  • a suitable solvent such as toluene, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone may be used.
  • the composition was coated with a gravure coater on both surfaces of a non-magnetic substrate made of a polyethylene terephthalate film of 32 ⁇ m in thickness so that the thickness of each coating after dried was 4.0 ⁇ m. Thereafter, the coated substrate film was calendered and punched to produce a magnetic disc of 47 mm in diameter (Sample No. 1).
  • Example No. 2 In the same manner as in Example 1 but using cobalt-containing ⁇ -Fe 2 O 3 powder (BET specific surface area, 20 m 2 /g; particle size, 0.4 ⁇ m; axis ratio, 8; coercive force, 650 Oe; saturation magnetization 79 emu/g) in place of the iron metal powder, a magnetic disc was produced (Sample No. 2).
  • Example Nos. 3-7 In the same manner as in Example 1 but using a low melting point aliphatic acid ester and/or a high melting point aliphatic acid ester as shown in Table 1, a magnetic disc was produced (Sample Nos. 3-7).
  • Example Nos. 8-12 In the same manner as in Example 1 but using 2-ethylhexyl oleate and n-butoxyethyl stearate in amounts (parts) as shown in Table 2, a magnetic disc was produced (Sample Nos. 8-12).
  • Example No. 13 In the same manner as in Example 1 but using no vinyl chloride-vinyl acetate-vinyl alcohol copolymer and using 18 parts of the polyurethane resin, a magnetic disc was produced (Sample No. 13).
  • Example No. 14 In the same manner as in Example 2 but using nitrocellulose (H 1/2 second) in place of the vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a magnetic disc was produced (Sample No. 14).
  • Example Nos. A-F In the same manner as in Example 1 but using a lubricating compound as shown in Table 3 in place of the mixture of the low melting point ester and the high melting point ester, a magnetic disc was produced (Sample Nos. A-F).
  • each of the sample magnetic discs was slidingly contacted with a Mn-Zn ferrite magnetic head at 3,600 rpm. Every one hour, contamination of the magnetic head and formation of flaws on the magnetic coating surface were visually observed.
  • Each sample was kept standing at 5° C. for 1,000 hours and examined for formation of white powder on the coating surface before sliding contact with the magnetic head.

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Lubricants (AREA)
US06/875,581 1985-06-20 1986-06-18 Magnetic disc Expired - Lifetime US4828925A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60-135800 1985-06-20
JP60135800A JPH0673174B2 (ja) 1985-06-20 1985-06-20 磁気記録媒体

Publications (1)

Publication Number Publication Date
US4828925A true US4828925A (en) 1989-05-09

Family

ID=15160112

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/875,581 Expired - Lifetime US4828925A (en) 1985-06-20 1986-06-18 Magnetic disc

Country Status (5)

Country Link
US (1) US4828925A (de)
EP (1) EP0206244B1 (de)
JP (1) JPH0673174B2 (de)
KR (1) KR940003386B1 (de)
DE (1) DE3681510D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937151A (en) * 1987-08-06 1990-06-26 Nissin Chemical Industry Co., Ltd. Coating composition with vinyl chloride polymer for magnetic recording medium
US5037695A (en) * 1989-03-28 1991-08-06 Tdk Corporation Magnetic recording medium
US5104751A (en) * 1988-06-06 1992-04-14 Fuji Photo Film Co., Ltd. Magnetic recording medium lubricant comprising a phthalic acid diester and fatty acid ester
US5776596A (en) * 1995-11-22 1998-07-07 Kao Corporation Magnetic recording medium having a magnetic layer and intermediate layer each containing a specified fatty acid and fatty acid ester

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0736216B2 (ja) * 1985-10-15 1995-04-19 日立マクセル株式会社 磁気デイスク
JPH0772938B2 (ja) * 1987-09-30 1995-08-02 富士写真フイルム株式会社 磁気記録媒体
JPH01300420A (ja) * 1988-05-30 1989-12-04 Hitachi Maxell Ltd 磁気記録媒体
JPH04103021A (ja) * 1990-08-22 1992-04-06 Matsushita Electric Ind Co Ltd 磁気記録媒体
JP2989239B2 (ja) * 1990-09-28 1999-12-13 ティーディーケイ株式会社 磁気記録媒体
JP4415293B2 (ja) 2001-02-15 2010-02-17 Ｔｄｋ株式会社 磁気記録媒体および磁気記録再生システム
JP2005018936A (ja) * 2003-06-27 2005-01-20 Sony Corp 磁気抵抗型ヘッド、磁気テープおよび磁気テープ式記録再生システム

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172176A (en) * 1977-06-01 1979-10-23 Sony Corporation Magnetic recording medium
US4247407A (en) * 1978-04-24 1981-01-27 Victor Company Of Japan, Limited Magnetic recording composition
US4383001A (en) * 1980-01-11 1983-05-10 Victor Company Of Japan, Limited Magnetic recording medium
US4383000A (en) * 1980-01-11 1983-05-10 Victor Company Of Japan, Limited Magnetic recording medium
US4405481A (en) * 1979-12-28 1983-09-20 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4420540A (en) * 1981-11-06 1983-12-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4522885A (en) * 1983-02-12 1985-06-11 Hitachi Maxell, Ltd. Magnetic recording medium
US4595640A (en) * 1983-12-27 1986-06-17 Minnesota Mining And Manufacturing Company Lubricant system for magnetic recording media containing isomeric acids or alcohols
US4601946A (en) * 1983-07-26 1986-07-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4647502A (en) * 1984-09-18 1987-03-03 Hitachi Maxell, Ltd. Magnetic recording medium
US4652500A (en) * 1985-04-04 1987-03-24 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4666784A (en) * 1985-07-26 1987-05-19 Toyo Boseki Kabushiki Kaisha Magnetic recording medium

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5619525A (en) * 1979-07-24 1981-02-24 Fuji Photo Film Co Ltd Magnetic recording medium
JPS5924438A (ja) * 1982-08-02 1984-02-08 Fuji Photo Film Co Ltd 磁気記録媒体
JPS59186131A (ja) * 1983-04-06 1984-10-22 Tdk Corp 磁気記録媒体
JPS6045935A (ja) * 1983-08-24 1985-03-12 Teijin Memorex Kk 磁気記録用媒体
JPS6098527A (ja) * 1983-11-04 1985-06-01 Konishiroku Photo Ind Co Ltd 磁気記録媒体
JPH0619828B2 (ja) * 1984-12-27 1994-03-16 コニカ株式会社 磁気記録媒体

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172176A (en) * 1977-06-01 1979-10-23 Sony Corporation Magnetic recording medium
US4247407A (en) * 1978-04-24 1981-01-27 Victor Company Of Japan, Limited Magnetic recording composition
US4405481A (en) * 1979-12-28 1983-09-20 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4383001A (en) * 1980-01-11 1983-05-10 Victor Company Of Japan, Limited Magnetic recording medium
US4383000A (en) * 1980-01-11 1983-05-10 Victor Company Of Japan, Limited Magnetic recording medium
US4420540A (en) * 1981-11-06 1983-12-13 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4522885A (en) * 1983-02-12 1985-06-11 Hitachi Maxell, Ltd. Magnetic recording medium
US4601946A (en) * 1983-07-26 1986-07-22 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4595640A (en) * 1983-12-27 1986-06-17 Minnesota Mining And Manufacturing Company Lubricant system for magnetic recording media containing isomeric acids or alcohols
US4647502A (en) * 1984-09-18 1987-03-03 Hitachi Maxell, Ltd. Magnetic recording medium
US4652500A (en) * 1985-04-04 1987-03-24 Fuji Photo Film Co., Ltd. Magnetic recording medium
US4666784A (en) * 1985-07-26 1987-05-19 Toyo Boseki Kabushiki Kaisha Magnetic recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937151A (en) * 1987-08-06 1990-06-26 Nissin Chemical Industry Co., Ltd. Coating composition with vinyl chloride polymer for magnetic recording medium
US5104751A (en) * 1988-06-06 1992-04-14 Fuji Photo Film Co., Ltd. Magnetic recording medium lubricant comprising a phthalic acid diester and fatty acid ester
US5037695A (en) * 1989-03-28 1991-08-06 Tdk Corporation Magnetic recording medium
US5776596A (en) * 1995-11-22 1998-07-07 Kao Corporation Magnetic recording medium having a magnetic layer and intermediate layer each containing a specified fatty acid and fatty acid ester

Also Published As

Publication number Publication date
KR940003386B1 (ko) 1994-04-21
KR870000684A (ko) 1987-02-19
JPH0673174B2 (ja) 1994-09-14
EP0206244A2 (de) 1986-12-30
EP0206244B1 (de) 1991-09-18
EP0206244A3 (en) 1989-08-30
DE3681510D1 (de) 1991-10-24
JPS61294637A (ja) 1986-12-25

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